"Was prescribed this for tension headaches.  It does something, but it makes me dizzy and light headed.  It seems to start working nearly immediately (reduces the pain by like 50-75%), but after not too long the headache will start slowly creeping back over the course of the next few hours.   I actually have a headache I've been attempting to treat with it right now and so far I've taken 7 pills over the course of 26 hours and it's still here."